The density of a gas at S.T.P. is 1.40 g/l. The molecular weight of the gas is:

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31.4

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Solution

The correct option is B 31.4
At S.T.P., 1 mol of a gas has a volume of 22.4 litres
mol. wt. of a gas = $d e n s i t y (g / l) \times 22.4 l / m o l$

$1.4 g / l \times 22.4 l / m o l = 31.36 \approx 31.4 g / m o l$

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